urgent question!!!

I am a US citizen. I am applying GC for my parents. They are currently here in the US. But I filed the application package I130/485 concurrently right after they arrived US using B2 visas. Will this be a problem? Somebody said I should have waited after they came to the US at least 2 months. Will the cases be denied? What should I do now? Please help me! I am so worried. If the cases are denied, what will happen to them?